Bolton told Digital Spy that a duet could be on the cards, praising the X Factor winner's "heartfelt" approach to her music.

"The only thing more important than a great instrument is the ability to put your heart into that instrument," he said. "That's what resonates with people, that's what moves human beings and she has that combination."

Bailey and Bolton opened last night's National Television Awards with a performance of 'Ain't No Mountain High Enough' - but the US musician admitted to DS that he had trouble hearing his backing track due to the "lively" audience.